Cathode-sheath model for field emission sustained atmospheric pressure discharges
- Cejas, E.
- Prevosto, Leandro
- Minotti, Fernando Oscar
- Ferreyra, M.
- Chamorro Garcés, Juan Camilo
- Fina, Brenda Lorena
DOIAbstract
The cathode-sheath region of a discharge in atmospheric pressure air with a flat copper cathode is numerically investigated by using a simple fluid model that takes into account non-local ionization. The effects of the cathode temperature are considered. Results are obtained in a wide current density range of 1–102 A/cm2 , which spans from normal glow discharge, through abnormal glow discharge, up to the early stages of the arcing transition. It is shown that the glow-to-arc transition arises from a field-emission instability at the cathode when the current density is larger than 10 A/cm2 , i.e., when the cathode field exceeds a critical value of about 45 V/lm for the conditions considered. It is also shown that the cathode temperature sign...
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